..postcard will give you an idea of their size..
...a very young George Kell " SH130 " and an aging Pepper Martin " SH143 "-- no gloss on front..backs are sepia too , and blank..the font used for the names is familiar...I don't think that they're a subset of the 1946-49 Sports Exchange because of their size ??
..thanks for your help..MikeGarcia